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Asphalt Institute Vacuum Viscometers are used to measure highly viscous materials such as bitumen, also known as asphalt cement.
A minimum sample size of 3mL and a bath depth of 7in (180mm) are required for testing. The elapsed time for a fixed volume of liquid to be drawn through the capillary tube is multiplied by a constant to determine absolute viscosity. Capillary is graduated and a Certificate of Calibration is included with each Viscometer. The 2in (51mm) Viscometer Neoprene Holder is required for operation to secure the viscometers and can be purchased separately. A Constant Temperature Viscosity Bath is also available separately.
The Asphalt Institute Vacuum Viscometers come in five models of varying sizes and ranges of viscosity. Each model measures viscosity at 140°F (60°C).
PT-111: 42–800 poise
PT-112: 180–3,200 poise
PT-113: 600–12,800 poise
PT-114: 2,400–52,000 poise
PT-115: 9,600–200,000 poise
PT-111, PT-114, PT-115: 12 x 2 x 2in (305 x 51 x 51mm), WxDxH
PT-112, PT-113: 10.25 x 1.625in (260 x 41mm), WxD
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